Cable overthrow loader for tractors



Dec. 25, 1951 CABLE OVERTHROW LOADER FOR TRACTORS 2 SHEETS-SHEET 1 Filed May 23, 1949 Dec. 25, 1951 T CABLE OVERTHROW LOADER FOR TRACTORS 2 SHEETS-SHEET 2 Filed May 23, 1949 QNN 4 ripen Em Patented Dec. 25, 1951 CABLEOX'ERTHROW LOADER EOE...

TRACTORSI Alexanden'wattt. Calgary, Alberta, Canada, ass: signon to; George Archibaldiltohinaon; Galganx;

Albertatfianada-r.

Application May 23,1,1949,; SerialNo. 94,780" IirGanadw June 14; 1 .747-

2Claims. 1; invention relates to: overthrow: loaders, that is to say; self=propelledi vehicles, usually of the track: crawler type, having'atithe endlgof arms; attached thereto: on:= each sideascoop: adapted to be driven by the vehicle-into a. mass of;ima.- terial and when filled to-ba lifted by the armsv longitudinally of and overthe vehicle: for: dis;- charge at the opposite end'thereof.

O-verthrow loadersof varyingconstructionhave;

been proposed and used, butznone. ofathemrhaye satisfactorily met: the difficulties which their: deasign presents. Among these: someofztheamost-ims:

portant are the combination ot'sufiicientrruggede ness andresistance to: deformation-.ofithe scoop.- carrying structure with reasonable-weightace commodation to the irregularities of the ground level over which the vehicle is required to move and simplicity of' construction andoperation.

I have devised a, constructionin which all the more desirable characteristics: of; an overthrow loader are present. In, this, construction the vehicle arms carrying the scoop are moved by cables attached to a winch deriving its power in the usual *mannerfromrthe engine:- of thevehicle. As has been previouslyproposed; these arms and also the overhead cable sheave-1supportingaframe are carried on girders on the sides of the vehicle forming part of its chassis below any springs with which it may be equipped, but the principal feature of my construction upon which its advantages chiefiy depend consists in the pivotal character of the connections between the girders and the horizontal cable sheave carryin frame, which relieve undue strain on the latter due to the movement of the loaded scoop and permits the adjustment of the frame to irregularities in the level of the ground on which the vehicle is operated.

The connections are made by members pivotally mounted on the girders so as to allow of a limited movement of the frame relative to the unsprung members of the vehicle chassis, both longitudinally and transversely of the latter and at the same time properly to transmit the weight of the scoop and its load to the chassis in the varying positions which these may occupy between the beginning of the lift and the discharge of the load. Their nature will more fully appear from the description which follows.

In the figures:

Figure 1 is a side elevation of an overthrow loader embodyin my invention, the upward position of the scoop being shown in broken lines;

Figure 2 is a rear elevation with the jib arms shown in a vertical position Fig. 3 is a front 'elevationzshowlng,therjimeame: in vertical position==partially inxbroken-elinesr: and- Figure 4 shows one form of an automaticrbrak mg -means on a larger scale.

In the embodiment of" the invention shown; inc the drawings; jib. arms; I on: each: side: ofithet loader (broken aways in; Figure. 1:) are.-'pivotaliyr attached at their'innerends 2..to girders23iiorme ingpartlof the chassis of the vehiclezlbelow the; springs thereof, and" at theinr-outerr ends: there; is: attached ascoop l atitheqpoints 5:. Thalia-arms: and the scoop. are alsozoonnected by side brackets 6i icy-which the angularrrelationbetween: themyis:

maintained;

Between: thenouter: ends: of; thezjib arms -Lthere: extends across-piece; 1i to;v which; aregbearably bracketed cable-1 sheaves"; 8; and-.anoundttheseypasss double ended cables d; extending over. sheaves. 1.01. and H) s to: awinch. I 2 oneiendtof. each. cableabeing anchored to one wwinding;drnmiofa.the twirr drum; winch and. the other to the fixed. framework, preferably the cross member. [3 Qf:.the overhead sheavecarrying framel4:.1. V

This' frame; 14 consists of two longitudinal members and at least two cross members [Stands I, allthe members; being-v rigidly. connected; to one anotherit It is supported.v on .each sidetby a5. V-shaped member having arms [6, ll connected with it near its forward and rearward ends. respectively, and it is centrally supported also at its forward end by a transverse beam member I8 rocking on a pivot 19 and supported pivotally at each of its outer ends, as shown at 20, by vertical pillars 2|.

At the lower end of each V-shaped member near the point at which the axes of the arms l6 and I! meet (which may preferably correspond with the horizontal centre line of the axle) is a longitudinal pivotal connection 22 indirectly plate-connected with the unsprung chassis members of the vehicle as shown at 22a, and this may preferably be on the vertical centre line of a rear driving wheel 23 as illustrated. Each forward pillar 2| is likewise pivotally connected with the unsprun chassis members either directly with the forward end of girder 3 or, as shown at 24, indirectly through a plate 24a attached thereto.

For simplicity of operation and convenience it is preferred that the ends of the jib arms I should not swing further towards the rear of the vehicle than the vertical, and that the scoop 4 should discharge into a chute 25 adjustably attached to the frame It by a support 26 and a. hinged support 21 and having its outlet controlled by a gate 28 which can be manipulated by the operator 0:

the arms and scoop on their return movement.

toward the loading position until they are affected by the force of gravity.

To avoid the overwinding of the cables 9 when the jib arms i have lifted the scoop into position to discharge its contents into thechute 25,.

provision must be made whereby the clutch and brake mechanisms of the winch are automatically governed by the movemnt of the jib arms This may be done by any convenient device, for example, a bell crank 32 on the rear leg I! ofone of the -.V-shaped members, engaged by one of the jib arms.

It will be observed that when the scoop t! has I been filled and the winch is operated to begin to lift the jib arms I the chief strains will be divided between the'inner pivoted ends 2 of the jib arms land the forward overhead sheaveslil. The latter of these strains will be transmitted to'the chassis through the pillars 2i and the forward'legs 16 of the V-shaped members, and will tend to cause both the V-shaped members and the pillars to tilt forwardly on their pivots 22 and 24 respectively, but as the jib arms i rise the strain on legs It will be gradually relieved and transferred to the rear legs I! of the V- shaped members and through these to the unsprung chassis until substantially the whole weight of the scoop andload is carried directly on the said chassis through the jib sarm's l to the pivots 22 as the jib arms reach the vertical position When the scoop load is transferred into the chute 25 its weight will be chiefly transmitted to'the 'chassis through the rear legs I! of the V- shaped members.

Irreg'ularities in the ground level, especially transverse irregularities affecting the forward portion of the loader but not the rear portion thereof, will tend to be compensated for by the movement of the cross-piece [8 on its pivot IS in conjunction with that of the pivoted pillars 2i, and avoidable strains on the cable sheave supporting frame will be thus relieved.

What I claim as my invention is:

1. A cable operated overthrow loader for use iwith a crawler type tractor which comprises a chassis, jib arms pivotabiy mounted on the ungsprung parts of said chassis adjacent the rear axle, a scoop attached to said jib arms, an overhead cable sheave supporting frame, a V-shaped support for said frame mounted at its lower end to each side of the unsprung parts of said chassis for limited pivotal movement in a longitudinal plane and r'igidly attached at the upper ends of its arms near the forward and rear extremities of said frame, a cross-piece centrally mounted to the forward end of said frame for pivotal-movement in a transverse plane and at a point forwardly of the'point of attachment of the upper end of the forward arm of the V- shaped support, and a substantially vertical pillar at each side of said chassis attached at its lower end to said chassis for limited pivotal movementin a longitudinal plane, and attached at its upper end to said cross-piece for pivotal movement in a transverse plane.

'2. A cable operated overthrow loader according to claim 1 in which said frame is substantially rectangular, comprising two longitudinal members and transverse members, and said crosspiece is attached centrally of the forward trans: verse member.

" ALEXANDER WATT.

I REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

